Which of the following refrigerants is a CFC-type refrigerant?

A. R-22.
B. R-123.
C. R-134a.
D. R-12.


Answer: D

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External parasites such as lice and mites may be controlled by using a shampoo containing ____________________

Fill in the blank(s) with correct word

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When using a shingle hatchet, the sliding gauge is used to measure the _____

a. gap between shingles b. gap between the nails and the top of the shingle c. amount that each shingle should overlap the shingle next to it d. amount of exposed surface for each shingle

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Which of the following statements best describes electronic timing relays?

A) Electronic timing relays are more repeatable than pneumatic timing relays. B) Electronic timing relays are more accurate than pneumatic timing relays. C) Electronic timing relays are more economical than pneumatic timing relays. D) All of the above

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Zener diodes can be used in the feedback circuit to limit a comparator output. What is this method called?

A) output bounding B) threshold limiting C) binding D) level saturation limitation

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